# ECCA-AI > ECCA-AI runs a question through several independent AI engines, then adjudicates their answers into one result and shows the reasoning that settled it. - Academic reasoning and dialectic evaluation studio only, not a medical device. - Engine roster, limits, and what each plan actually delivers are stated on /capabilities and /pricing. - The public golden set, latest results, and adjudications are served under /evals/ and are described on /method. - The long-form description of the product, routes, and API is /llms-full.txt; the API contract is /openapi.json (OpenAPI 3.1). ## Start here - [Never trust one AI again | Ecca](https://eccaai.com/): ECCA is a second opinion on anything an AI tells you. - [Never trust one AI again | Ecca](https://eccaai.com/ask): ECCA is a second opinion on anything an AI tells you. - [ECCA capabilities — what is live, what is in build, what is next](https://eccaai.com/capabilities): Every ECCA capability with an honest status: live surfaces you can open right now, work in build, and the roadmap — no fake demos, receipts on the method page. - [The Ratification Method, how ECCA measures its accuracy](https://eccaai.com/method): What ECCA's 99.9% ratified-accuracy target means: the lane system, the evidence bar, the adversarial checks, and the honest distance left. - [About ECCA — built after one wrong answer — Ecca](https://eccaai.com/about): ECCA is a second opinion on anything an AI tells you. - [Frequently Asked Questions — ECCA-AI Meta-Intelligence](https://eccaai.com/faq): How ECCA-AI works: multi-engine verification, Socratic distractor refutation, answer modes, the API, and what the platform does and does not claim. - [How to Use ECCA — Plain-Language Guide — ECCA-AI Meta-Intelligence](https://eccaai.com/guide): ECCA is a second opinion on anything an AI tells you. - [Check an Answer You Already Have — ECCA-AI](https://eccaai.com/check): Paste a question and the answer another AI gave you. ECCA sends the question alone to up to 6 registered engines, which never see your paste, and shows how many agree with your answer, what split them, and each divergent claim with its sources. - [Check your AI against other AIs — a 15-minute lesson for teachers — Ecca](https://eccaai.com/teachers): A printable one-page lesson for high school and first-year college classes: ask several AIs the same question, find where they split, then check the split by hand. A checking tool, not a homework tool. - [For instructors — what ECCA does and what it does not do — Ecca](https://eccaai.com/for-instructors): What ECCA does for a course and what it does not do: it sends one question to up to 6 registered engines, shows where they split before one checked answer, and can seal a dated proof page to cite. It is built to check answers, not to write assignments, and the sources the engines cite still need opening. - [ECCA-AI en español — Varias IA responden, una verificación decide](https://eccaai.com/es): ECCA-AI envía tu pregunta a varios motores de IA independientes, los contraexamina y devuelve una sola respuesta adjudicada con su razonamiento visible. Gratis hoy, sin tarjeta. No es un dispositivo médico. ## Worked answers and sample dispatches - [Base-rate alarm: watch six engines audit Bayes' rule | ECCA](https://eccaai.com/answers/base-rate-alarm): Run one factory-alarm probability question through ECCA's live registered engine set and inspect the measured disagreements before the checked answer. - [Simpson's paradox admissions matrix: live engine comparison | ECCA](https://eccaai.com/answers/simpson-admissions): Let ECCA's registered engines examine an admissions table where the overall rate reverses both department-level comparisons, then show their disagreement and comparison. - [Monty Hall: should you switch doors? Live engine comparison | ECCA](https://eccaai.com/answers/monty-hall): Send the three-door problem to ECCA's registered engines, watch where their reasoning splits on the host's rule, and check the checked answer against a 300-game count. - [Regression to the mean: did the coaching work? Live engine comparison | ECCA](https://eccaai.com/answers/regression-to-the-mean): Put a before-and-after coaching claim in front of ECCA's registered engines and see whether the checked answer separates a real effect from ordinary retest regression. - [Compound growth: does 6% really double in 12 years? Live engine comparison | ECCA](https://eccaai.com/answers/compound-growth): Send a compound-interest claim to ECCA's registered engines, watch where the rule of 72 and the exact factor diverge, and check the checked answer against the year-by-year multiplication. - [Projectile range: 25 m/s at 40 degrees — live engine comparison | ECCA](https://eccaai.com/answers/projectile-range): Put a projectile-range problem in front of ECCA's registered engines, see the sine-of-the-wrong-angle mistake surfaced as friction, and check the checked distance against the flight-time multiplication. - [Birthday paradox: 23 people, one shared birthday? Live engine comparison | ECCA](https://eccaai.com/answers/birthday-paradox): Send the 23-person birthday question to ECCA's registered engines, watch their reasoning split on people versus pairs, and check the checked answer against the exact 23-fraction product. - [Gambler's fallacy: after five heads, is tails due? Live engine comparison | ECCA](https://eccaai.com/answers/gamblers-fallacy): Send the five-heads streak to ECCA's registered engines, watch their reasoning split on the streak versus the next flip, and check the checked answer against a 3,200-sequence count. - [Prosecutor's fallacy: a 1-in-10,000 match, how likely guilty? Live engine comparison | ECCA](https://eccaai.com/answers/prosecutors-fallacy): Send the rare-match question to ECCA's registered engines, watch their reasoning split on which conditional the 1-in-10,000 figure names, and check the checked answer against a count of the matching people. - [Sample six-engine reasoning: the base-rate trap | ECCA-AI](https://eccaai.com/demos/academic-reasoning): Inspect a sample ECCA fixture where six registered engine roles separate sensitivity from the probability after a positive result. - [Sample document analysis: where evidence stops | ECCA-AI](https://eccaai.com/demos/document-analysis): Read a fixture-backed ECCA memo analysis that shows where six registered engine roles split over evidence, scope, and recommendation. ## Engines - [Combinatorial Socratic Truth Matrix — ECCA-AI Engine](https://eccaai.com/engine/socratic-truth): Explore how ECCA-AI constructs adversarial proofs to refute distractors and establish verified mathematical and conceptual truth across up to 6 registered engine tiers. - [Metacognitive Calibration & Brier Scoring — ECCA-AI Engine](https://eccaai.com/engine/metacognitive-calibration): Master epistemic accuracy with ECCA-AI's calibration benchmark and the Brier scoring method behind it — what exists today, stated plainly. - [Machine-Readable Reasoning Traces (JSONL) — ECCA-AI Engine](https://eccaai.com/engine/reasoning-traces): Export structured JSONL reasoning traces containing multi-engine arbitration steps, Socratic refutations, and calibration status for AI benchmarking. - [Deterministic Argument Verifier — ECCA-AI Engine](https://eccaai.com/engine/argument-verifier): How ECCA-AI's rule-based argument verifier reads the question and the first answer for fallacy signals and review points, on every dispatch across up to 6 registered engines, and what its receipts do and do not mean. - [Cross-Engine Disagreement Diff — ECCA-AI Engine](https://eccaai.com/engine/disagreement-diff): How ECCA-AI compares the answers returned by up to 6 registered engines sentence by sentence, scores their lexical divergence, flags opposing-direction claims, and reports the result as a receipt rather than a verdict. - [Consensus Cascade and Circuit Breaker — ECCA-AI Engine](https://eccaai.com/engine/consensus-cascade): How ECCA-AI decides which of up to 6 registered engines a deep solve dispatches: the two-engine probe on free solves, the divergence gate that expands it, the every-engine policy on paid solves, and the circuit breaker that routes around a failing engine. ## Subjects - [Academic Writing, Logic & Dialectic Review — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/academic-writing): Evaluate thesis statements, logical argumentation, rhetorical fallacies, and academic literature synthesis with multi-engine Socratic peer review. - [Accounting & Financial Reporting Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/accounting): Solve financial and managerial accounting: journal entries, adjusting entries, depreciation schedules (straight-line, double-declining-balance), FIFO/LIFO/weighted-average inventory costing, CVP break-even, and ratio analysis with multi-engine Socratic proofs. - [Biology, Genetics & Biomechanics Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/biology): Solve AP biology, Mendelian and non-Mendelian genetics, Hardy-Weinberg equilibrium, cellular respiration, and biomechanics with multi-engine Socratic proofs. - [Business, Economics & Finance Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/business-finance): Solve corporate finance, DCF valuation, Black-Scholes options, microeconomics Nash equilibria, and macro econometrics with multi-engine Socratic proofs. - [Calculus & Real Analysis Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/calculus): Solve AP, collegiate, and advanced real analysis calculus with multi-engine Socratic proofs, step derivations, and distractor refutations. - [Chemistry, Thermodynamics & Stoichiometry Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/chemistry): Solve AP and organic chemistry, equilibrium thermodynamics, Hess's Law, and redox reactions with multi-engine Socratic refutations and molar balancing. - [Computer Science & Algorithms Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/computer-science): Solve algorithm analysis, Big-O complexity, recurrences, data structures, discrete math, and automata questions with multi-engine Socratic proofs. - [Data Structures Solver: Heaps, Trees & Hash Tables — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/data-structures): Trace binary heap inserts and extractions, binary search tree operations, hash table load factors and probe counts, and dynamic array growth with multi-engine Socratic proofs and the invariant checked after every step. - [Differential Equations & ODE Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/differential-equations): Solve separable and linear ODEs, integrating factors, second-order equations, Laplace transforms, and initial value problems with multi-engine Socratic proofs. - [Discrete Mathematics & Combinatorics Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/discrete-mathematics): Solve inclusion-exclusion counts, modular arithmetic, recurrences with closed forms, combinations and permutations, proofs by induction, and graph basics with multi-engine Socratic proofs. - [Economics & Econometrics Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/economics): Solve micro and macro economics: supply-demand equilibrium, elasticity, consumer surplus, marginal analysis, and econometrics with multi-engine Socratic proofs. - [Electricity & Magnetism Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/electricity-and-magnetism): Solve series-parallel circuits, Coulomb's law, electric fields and potential, capacitor energy, and magnetic forces on charges and wires with multi-engine Socratic proofs and a power balance on every circuit. - [Geometry & Proofs Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/geometry): Solve two-column proofs, triangle congruence, circle theorems, power of a point, coordinate geometry, and exact area and volume problems with multi-engine Socratic proofs. - [Linear Algebra & Matrix Methods Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/linear-algebra): Solve eigenvalues, eigenvectors, determinants, row reduction, rank-nullity, orthogonality, and diagonalization with multi-engine Socratic proofs. - [Macroeconomics Solver: Multipliers, GDP & Money — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/macroeconomics): Solve Keynesian equilibrium output and spending multipliers, real versus nominal GDP with the deflator, money-multiplier deposit expansion, and unemployment rates with multi-engine Socratic proofs and an identity check on every figure. - [Number Theory & Modular Arithmetic Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/number-theory): Solve linear congruences, modular inverses by the extended Euclidean algorithm, gcd and lcm, Fermat and Euler reductions, and divisor counts with multi-engine Socratic proofs and a back-substitution check on every answer. - [Organic Chemistry & Mechanisms Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/organic-chemistry): Check SN1/SN2/E1/E2 mechanisms, assign R/S stereocenters, rank acid strength by pKa, and trace resonance and arrow-pushing with multi-engine Socratic proofs. - [Physics & Classical Mechanics Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/physics-mechanics): Solve AP physics, Newtonian mechanics, conservation of energy, rotational kinematics, and electrodynamics with multi-engine Socratic proofs. - [Precalculus, Trigonometry & Functions Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/precalculus): Solve trig identities and equations, unit circle values, logarithms, exponentials, sequences, conic sections, and function transformations with multi-engine Socratic proofs. - [Probability & Counting Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/probability): Solve binomial and complement problems, conditional probability, expected value, and Bayes' rule with natural-frequency checks and multi-engine Socratic proofs on every worked step. - [Psychology & Research Methods Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/psychology): Work through psychology coursework: research methods, study-design critique, statistics interpretation, and theory comparison with multi-engine Socratic proofs. - [Statistics, Probability & Bayes Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/statistics): Solve AP and college statistics, Bayesian inference, hypothesis testing (ANOVA, t-test), and probability distributions with multi-engine Socratic proofs. - [Thermodynamics & Heat Engines Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/thermodynamics): Solve Carnot and real heat-engine cycles, ideal-gas isothermal and adiabatic processes, entropy changes, and first-law energy balances with multi-engine Socratic proofs and unit checks on every step. - [Trigonometry & Trig Equations Solver — ECCA-AI Meta-Intelligence](https://eccaai.com/solutions/trigonometry): Solve trigonometric equations on an interval, sum and difference identities, the law of sines and cosines, the ambiguous SSA case, and inverse functions with multi-engine Socratic proofs. ## Research topics: see where the engines clash - [Psychology research: see where the engines clash | ECCA-AI](https://eccaai.com/psychology): Up to six AIs answer your psychology question separately, then you see where they agree and where they clash. - [Learning and study skills: see where the engines clash | ECCA-AI](https://eccaai.com/learning): Study-method questions answered separately by up to six AIs, with the disagreements shown. - [Nutrition and supplements: see where the engines clash | ECCA-AI](https://eccaai.com/nutrition): Conflicting nutrition claims, answered separately by up to six AIs, with every disagreement shown. - [Money and business: see where the engines clash | ECCA-AI](https://eccaai.com/money): Personal finance and small-business questions, with the evidence and the dissent shown. ## Product - [Engine status — ECCA](https://eccaai.com/status): Public engine availability, last successful checks, and seven-day agreement where measured. Missing observations are shown explicitly. - [Weekly AI Disagreement Index | ECCA](https://eccaai.com/index/latest): How often the AIs split on real ECCA questions each week, by topic. Counts only, claim-level splits, no questions stored. A split is a disagreement, not a mistake. - [Weekly AI Disagreement Dataset | ECCA](https://eccaai.com/dataset/latest): Open-access weekly dataset of AI claim disagreements by coarse topic under CC-BY 4.0. Aggregate counts only, no prompt text, no vendor names. - [Ecca Pricing — up to six AIs check every answer](https://eccaai.com/pricing): Ecca plans: Free deep solves start with two engines and expand to every configured engine on measured disagreement; Pro and Enterprise run every engine every time, with the split shown. Not a medical device. - [ECCA-AI Knowledge Arena — Head-to-Head Dialectic Duel](https://eccaai.com/arena): Two engine stances argue a thesis you choose, one for and one against, with engine identities hidden. A deterministic rule-based verifier counts the reasoning signals in each stance and names the stronger case; no model scores the verdict. - [The Verification Thesis — ECCA-AI Meta-Intelligence](https://eccaai.com/thesis): Why ECCA-AI is built as a verification layer over frontier engines instead of one more general chatbot: the asymmetric bet, the comparison moat, and the honest pre-mortem. - [Ecca API — Developer guide](https://eccaai.com/developers): Build with the Ecca API. Copy a working request, manage API keys, stream answers, and find the response fields and errors your integration needs. - [Changelog — What Changed on ECCA-AI](https://eccaai.com/changelog): Every merged change to eccaai.com, one entry per pull request, generated from the merged pull requests. Each entry says what its pull request title says, and whether an independent check is on record. - [Add ECCA to Your AI — Share Any Answer for a Second Check — ECCA-AI](https://eccaai.com/add): Two one-tap ways to send an answer another AI gave you into the ECCA studio: the system share sheet on your phone, and a bookmarklet for your browser. Nothing is sent to the engines until you press Ask. - [Privacy — What ECCA Receives, Stores and Sends — ECCA-AI](https://eccaai.com/privacy): What ECCA receives when you ask a question, where that question is sent, what is stored and for how long, and how to delete it. Stated from the code the product runs, not from a template. - [Split Atlas — Where the AIs Disagree, by Topic](https://eccaai.com/atlas): A public, anonymised map of where up to six AIs disagree, by topic: how many claims agreed, how many split, what caused the split, and which AI dissented. Counts come from consented records or say SAMPLE.